glass shader not working with normal map in cycles
I SOLVED IT !!! I did another object and again I ran into the same problem. But this time the mesh looked fine from above but completely black from below. I switched from object space to tangent space and after a few hours I decided to play around with the normal map strength and it seems that glass shader doesn´t like normal map values greater than 0.4 and After 0.46 the mesh starts looking completely black.

this values are for my particular project.